Ted Yu commented on HBASE-19969:

Looking at 
hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestGet.java :
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Assert;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
The relative order of junit import is exactly the same as that in 

> Improve fault tolerance in backup merge operation
> -------------------------------------------------
>                 Key: HBASE-19969
>                 URL: https://issues.apache.org/jira/browse/HBASE-19969
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>            Priority: Major
>         Attachments: 19969-v4.patch, HBASE-19969-v1.patch, 
> HBASE-19969-v2.patch, HBASE-19969-v3.patch
> Some file system operations are not fault tolerant during merge. We delete 
> backup data in a backup file system, then copy new data over to backup 
> destination. Deletes can be partial, copy can fail as well

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